Stool form and regularity
Tomorrow’s Nutrition Sunfiber PHGG Powder
Partially hydrolyzed guar gum in a tasteless powder, the low-FODMAP fiber that helps both constipation and loose stools in the trials.
- Format
- Powder, once a day
- Type
- Fiber
- Cost
- $0.83 a day
- Customer rating
- 4.5 out of 5 from 3,751 ratings from Amazon
What customers consistently report
- Regularity without the gas that other fibers cause
- Dissolving completely in anything, hot or cold, with no taste or grit
- Settling both ends of an unpredictable bowel
Those are the themes that recur across the reviews. High review confidence — 4.5 from 3,751 Amazon ratings on the 30-serving listing.
Why it might work
Guar gum is a thick gel; partially hydrolyzing it cuts the chains so it dissolves clear and does not thicken, while still being fermented slowly in the colon into short-chain fatty acids. That slow fermentation adds water and bacterial mass to hard stools and, by a different route, firms loose ones, which is why the trials see it help in both directions with little gas.
What the research supports
Ingredient-level evidence, and reasonably good. A randomized trial in 188 people with IBS found partially hydrolyzed guar gum improved symptoms at least as well as wheat bran with far better tolerance. Trials in constipation and in diarrhea-predominant bowels both show normalization of stool form, which is unusual for a fiber. Sunfiber is the branded PHGG used in several of these studies and is certified low FODMAP by Monash University. No trial of this Tomorrow’s Nutrition packaging specifically was found.
What the label discloses
The only ingredient is Sunfiber, a branded partially hydrolyzed guar gum, at 6 g of soluble fiber per serving. Monash University low-FODMAP certification is stated. No third-party testing certificate is published beyond the ingredient supplier’s. The catalog also lists the same ingredient from California Gold Nutrition at a lower price.
Who this tends to suit
We match this product to people reporting constipation, irregular bowel habits, bloating, loose stools and alternating constipation and loose stools. It fits someone whose priority is regularity or a steady daily routine. Whether it is the best fit for you depends on the rest of your answers — what you have already tried, what format you will take, and anything that has to be ruled out.
Where it may not fit
The label supports vegan, gluten-free, dairy-free, no added sweeteners and minimal ingredient list. A powder only works if you will take it once a day, every day.
Side effects and what to be aware of
It is more expensive per serving than plain psyllium or the same ingredient from other brands. The effect builds over weeks rather than days, and a few people report bloating at the start. It has no cholesterol effect, because it does not gel the way psyllium does.
Is this the right one for you?
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Others we researched for the same job
These sit in the same role as Tomorrow’s Nutrition Sunfiber PHGG Powder — stool form and regularity — so they are the sensible things to weigh it against.
See all the products we have researched →
Related reading
Background on how this type of product works, read from the trial evidence.